cysteine
cysteine — 名詞
1. A type of amino acid — one of the molecules that form proteins — whose structure
半胱氨酸
含硫胺基酸，蛋白質的組成單元
A type of amino acid — one of the molecules that form proteins — whose structure includes a sulfur atom; two cysteine units can bond together to create the substance called cystine. It plays a role in building hair, nails, and skin, and in the body's antioxidant defenses.
Dr. Astrid explained how cysteine helps the body produce glutathione, a key antioxidant.
Astrid 博士解釋了半胱氨酸如何幫助身體製造重要的抗氧化劑——穀胱甘肽。
explain + how-clause showing biological function
Hair and nails get their strength from the high cysteine content of keratin proteins.
頭髮和指甲的韌性來自角質蛋白中高含量的半胱氨酸。
cysteine content of + [noun] — quantifying presence in a substance
After the surgery, Bao started eating more cysteine-rich foods such as eggs and chicken.
手術後，Bao 開始多吃富含半胱氨酸的食物，像是雞蛋和雞肉。
The lab technician measured the concentration of free cysteine in each blood sample.
實驗室技術員測量了每個血液樣本中游離半胱氨酸的濃度。
In large proteins, cysteine molecules often form strong bonds that hold the overall shape together.
在大型蛋白質中，半胱氨酸分子經常形成強鍵，以維持整體結構。
- Cys
Three-letter abbreviation used in biochemistry and protein notation, e.g. 'Cys25' refers to the cysteine residue at position 25
用法筆記
In biochemistry writing, 'cysteine' is usually treated as an uncountable noun when referring to it as a general substance (e.g. 'cysteine is found in hair'), but it may be countable when describing individual molecules or residues (e.g. 'three cysteines in the protein chain'). Do not confuse with cystine, which is the dimer formed when two cysteine molecules bond through their sulfur atoms.